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RISS 인기검색어
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- 저자 : 황동현(Donghyeon Hwang) (검색결과 6 건)
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- 유료
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황동현(Donghyeon Hwang),김지용(Jiyong Kim),이준헌(Junheon Lee),김관주(Kwanju Kim),조성산(Sungsan Cho),김재철(Jaechul Kim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
스킬 소음은 차량의 곡선 주행시 차륜과 레일 사이의 횡방향 점착-미끄럼 운동에 의해서 발생하는 소음이다. 대표적 과도 특성을 나타내는 스킬 소음의 정확한 예측을 위해서는 발생원인 차륜과 레일간의 횡방향 접촉력의 정확한 파악이 요구된다. 이를 설명하기 위한 다양한 이론이 존재한다. 하지만 해당 이론들은 다양한 가정에 의하여 사용이 제한된다. 본 논문에서는 유한요소 해석법을 이용하여 가능한 가정에 의한 제약없이 스킬소음이 발생하는 조건을 판단할 수 있는 해석적 방법 개발을 목적으로 한다. 이를 위하여 스킬 소음이 발생하는 조건에서의 유한요소 모델을 작성하고, 접촉영역에서 발생하는 횡방향 접촉력을 예측하여 점착계수와 크리피지의 관계를 도출한다. 작성된 마찰특성 곡선을 이용하여 크리피지가 약 0.005 이상일 경우 스킬 소음 발생을 예상했다. Squeal noise occurs due to lateral stick-slip mechanism while negotiating curve track. It is necessary to estimate lateral creep force that represent unstable response for prediction of squeal noise. There are many theories to estimate contact force for 3D rolling contact problem. But most of them are limited by various assumptions. This paper aims to predict occurrence of squeal noise without limitation that concerning 3D rolling contact theories using finite element analysis. The relationship between adhesion coefficient and creepage was presented by calculating lateral creep force in the contact area. Occurrence of squeal noise was assessed by friction characteristic curve. Squeal noise was expected when creepage is over 0.005.
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김지용(Jiyong Kim),황동현(Donghyeon Hwang),이준헌(Junheon Lee),김관주(Kwanju Kim),김재철(Jaechul Kim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
스킬 소음은 급격한 곡선 부분에서 발생하는 듣기 싫은 고주파수 영역의 소음을 말한다. 이러한 소음은 차륜과 레일간 횡 방향 접촉력이 차륜, 레일을 가진 하면서 발생한다. 실제 차량에서는 접촉력과 관련 인자들을 제어하기 어려움이 있으므로, 스킬소음 축소 실험장치를 제작하였다. 제작한 실험 차륜은 가능한 실지 차량과 유사한 동특성을 갖도록 좌우 차륜을 가지고 있으며, 좌우 레일 롤러를 독립적으로 제어하여 곡선부에서의좌우 속도 차를 구현 가능토록 하였다. 또한 곡선구간 주행 시의 과도 특성을 나타낼 수 있도록 구동각 및 구동속도를 실시간으로 제어가능하다. 레일 롤러에 장착된 스트레인게이지를 이용하여, 차륜과 레일 사이의 접촉력을 측정한다. 여러 인자가 접촉력과 스킬소음을 발생시키는데 미치는 영향을 살펴보고자 한다. Squeal is a harsh noise of the high-frequency range occurring at the sharp curve tracks. The noise generates while lateral traction force excites the wheel and the rail. Field measurements are difficult to control the parameters and the contact force. Thus, we have made the scaled test rig. The unique feature of our test rig is that wheelset’s movement is similar to that of the railway, as real as possible. The left and right rail roller can be controlled independently for realization of difference of left and right speed at the curved rail. The attack angle and rail roller speed are controlled in real time for simulating a transient characteristic of the driving curve. the contact force between the wheel and the rail are measured by the stain-gage mounted on the rail roller. The relation between creepage and creep force and the criteria for squeal noise have been investigated.
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HSTR(Hongik Squeal Test Rig) 이용한 스킬 소음의 실험적 특성 연구
김지용(Jiyong Kim),황동현(Donghyeon Hwang),이준헌(Junheon Kim),김관주(Kwanju Kim),김재철(Jaechul Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Squeal is a harsh noise of the high-frequency range occurring at the sharp curve tracks. The noise generates while lateral traction force excites the wheel and the rail. Field measurements are difficult to control the parameters and the contact force. Thus, we have made the scaled test rig. The unique feature of our test rig is that wheelset’s movement is similar to that of the railway, as real as possible. The left and right rail roller can be controlled independently for realization of difference of left and right speed at the curved rail. The attack angle and rail roller speed are controlled in real time for simulating a transient characteristic of the driving curve. the contact force between the wheel and the rail are measured by the stain-gage mounted on the rail roller. The relation between creepage and creep force and the criteria for squeal noise have been investigated.
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축소 모델 실험장치를 이용한 철도 스킬소음의 특성에 대한 실험적 연구
김지용(Jiyong Kim),황동현(Donghyeon Hwang),이준헌(Junheon Lee),김관주(Kwanju Kim),김재철(Jaechul Kim) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.5
Squeal noise is a harsh, high-pitched sound that occurs when railways are running at sharp curve tracks. The cause of squeal noise is known to be the transient lateral traction force between wheel and rail. Field measurements are too difficult to control the parameters. Thus, the scaled test rig should have been made in order to investigate the generating mechanism of squeal noise. The unique feature of our test rig, HSTR(Hongik Squeal Testing Rig), is that DOFs of its wheelset are as close to as those of the real railway. The attack angle and running speed of the rail roller are controlled in real time for simulating a transient characteristic of driving curve. The environment conditions, such as given axle load, running speed, and wheels yaw angle have been identified for generating squeal noise and the squeal noise itself has been measured. The relation between wheel creepage and creep force in lateral direction and the criteria for squeal noise have been investigated, which results has been verified by finite element method.
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Simulation and experimental study on the flow-induced noise in a hydraulic control valve system
Daehyeok Kang(강대혁),Byunghee Kwon(권병희),Jehyuk Han(한제혁),Chiho Kim(김치호),Bora Lee(이보라),Donghyeon Hwang(황동현),Cheol Park(박철) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Generally, the control valve system in an automatic transmission (A/T) supplies automatic transmission fluid to a variety of actuators in the A/T through oil circuits to regulate the fluidic pressure of actuators. Since, discharge fluid pressure fluctuates in a certain frequency derived from hydro-mechatronics devices, it is very important to avoid hydroacoustic resonance to prevent passengers from hearing noise in cabin: when the frequency of pressure fluctuation coincides with the natural frequency of an oil circuit. However, it is challenging to predict the transient behavior of hydraulic pressure oscillating with high frequency including the amplitude of resonance pressure, because properties of automatic transmission fluid such as operating pressures change transiently in actual hydraulic control applications. This paper presents a dynamic simulation model for transient pipe flow to predict the behavior of hydraulic pressure in the time domain and a correlation with experimental data. Finally, the optimal parameter value was proposed by using the simulation model, and it was confirmed to improve cabin noise level in the actual vehicle.
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